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Sika FerroGard 650/670/675 Galvanic Anodes are engineered zinc anodes used for the protection of reinforcing steel in concrete. Anode grade zinc is encased in a proprietary mortar designed to optimize performance.

Where to Use

Patch repairs within concrete or along joints between new and existing concrete. Effective in chloride contaminated and carbonated concrete. Used to prevent the “Halo” or “Ring” anode Corrosion effect.


  • Anode Mortar Shell - uses proprietary technology that provides excellent transport of reactants to the surface of the zinc anode and corrosion products away from the surface of the zinc, using a chelation process. The encasing mortar will not cause corrosion of reinforcing steel.
  • Proven technology – supported by 10+ years of development and testing.
  • Cost Effective – lowers Life Cycle Cost of repairs.
  • Auto-Corrosion – encasing mortar maintains performance but does not auto- or self-corrode the zinc anode. n Ease of Installation – uses standard attachment methods known to industry.
  • Self-Powered / Self Regulating – creates own protective current that adjusts to demand.
  • Maintenance Free – requires no monitoring or maintenance.
  • Safe to Use – protects conventional and pre-stressed / post-tension reinforcing steel; moderate pH safe to handle without PPE.
  • Tie Wires – galvanized steel tie wires (annealed) are pre-twisted to form a cradle that accepts reinforcing steel, enables a better electrical contact and extends “throwing power”.
  • Service Life – capable of 10+ years of protection depending on design and conditions.

How to Use

Multiple factors must be considered to determine the spacing of the FerroGard anode, including the structure’s temperature, moisture content, chloride content, the steel surface area and placement. In most applications, the spacing should not exceed 30inches.A design engineer should always be consulted to confirm final requirements. Consult FerroGard Anode Calculation sheet for engineered designs or refer to the Maximum Anode Spacing Chart below.


Surface Preparation: All loose and spalled concrete should be removed in accordance with ICRI Guideline No. 310.1R-2008 Guideline for Surface Preparation for the Repair of Deteriorated Concrete Resulting from Reinforcing Steel Corrosion. The Sika FerroGard anode positioning should be considered when removing the existing concrete.

Preparation: For correct electrical connection and anode function, the surface of the reinforcing steel should be untreated and cleaned to a near white surface condition in areas designated for the connection of the FerroGard anode. Refer to SSPC SP-10. Note, pre-soaking the SIKA FerroGard anodes in clean water for several minutes prior to installation is recommended to minimize dehydration of the repair mortar.

Continuity: The reinforcing steel within the patch area should be tested for continuity: DC resistance between bars should be ≤ 1 Ω. Make continuity corrections, if needed, by welding steel bonding wire between bars to achieve a DC resistance ≤ 1 Ω.

Positioning: In most applications, the FerroGard anode should be positioned at the perimeter of the repair and on plane with the reinforcing steel to provide a proper level of cover. Anodes must be positioned so that the entire anode and the wire connections to the reinforcing steel are totally covered by the repair material once the repair is complete. Note: Do not modify the shape of the anode to fit a hole.

Attaching: Tighten the two pairs of pre-twisted wires around the reinforcing steel in a double wrap pattern to achieve a sound electrical bond. The pre-twisted wire connectors provide a sound base, good electrical contact and proper spacing from the reinforcing steel to which the anode is attached. No additional form of attachment or electrical connection is necessary. Note: Use only the connector wires attached to the anode; do not use supplementary connection methods between the connector
loops and the rebar nor use a twisting tool to tighten the wires.

Verification: Verify sound electrical connection of the FerroGard® system to the reinforcing steel by checking for a DC resistance ≤ 1 Ω. 

Note: Conventional, commercially available repair mortars should be used to repair the concrete and encase the FerroGard anodes. The mix should have a resistivity of ≤20,000 Ω-cm. High polymercontent and silica fume should not be used in the mix. Ifthe repair design requires a mix with resistivity >20,000 Ω-cm,then use an encasement mortarto encase the anode and bridge the area between the anode and the existing concrete. SikaRepair 222 (with water) or SikaRepair 223 (with water) are acceptable encasement mortars. Place encasement materials in accordance with conventional techniques to assure good consolidation. The drawings below depict acceptable methods to install the embed mortar.

Rebar coatings such as Sika Armatec 110 EpoCem and Sikadur 32 can and should be used along with Sika FerroGard anodes as full system repair approach. The sketches below depict the proper way to install the rebar coating (and bonding agent). All the usual preparation techniques are employed (geometry of the repair area, cleaning the steel, surface preparation). The anodes are tied to the steel,continuity is verified and the rebarcoating is appliedas per the PDS. Pleasenote, avoid coating the anode itself. The tie wires may be coated too as long as continuity to the steel is ensured.

Do not use any form of battery or impressed current in association with the FerroGard anode or apply an electrical current to the reinforcing steel prior to or after the repair. Do not install a preformed high resistivity or non-conductive barrier between the FerroGard anode and the reinforcing steel. Do not apply corrosion inhibitors directly on the FerroGard anode body or connecting wires, especially on or near the wire connection point with the reinforcing steel.

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